There’s another way of making a structure. A shell structure is just made of a thin, curved outer layer and it’s hollow inside. Like this, or this, or this, or this. Frame structures can be ...

Similarly, when these stars explode in supernovae, they send shockwaves that push gas outward, creating expanding shell-like ...

The parrot's brain has a nested 'core and shell' structure for vocal learning. Neurons in the shell surrounding the established vocal centers of the parrot brain play a part in vocal learning and ...

Scientists believed that ammonites, like modern cephalopods ... between 252 and 66 million years ago, their shell structures grew smaller, more tightly coiled, and more complex.